/*
* Copyright (c) 2006-2007 Erin Catto http:
*
* This software is provided 'as-is', without any express or implied
* warranty.  In no event will the authors be held liable for any damages
* arising from the use of this software.
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked, and must not be
* misrepresented the original software.
* 3. This notice may not be removed or altered from any source distribution.
*
* Converted for The Render Engine v2.0
* Aug. 4, 2010 Brett Fattori
*/

Engine.include("/physics/collision/Features.js");

Engine.initObject("b2ContactID", null, function() {
   
   // We use contact ids to facilitate warm starting.
   var b2ContactID = Base.extend({

      features: null,
      _key: 0,

      constructor: function() {
         // initialize instance variables for references
         this.features = new Features();
         this.features._m_id = this;
      },

      Set: function(id) {
         this.set_key(id._key);
      },
      
      Copy: function() {
         var id = new b2ContactID();
         id.set_key(this._key);
         return id;
      },
      
      get_key: function() {
         return this._key;
      },
      
      set_key: function(value) {
         this._key = value;
         this.features._referenceFace = this._key & 0x000000ff;
         this.features._incidentEdge = ((this._key & 0x0000ff00) >> 8) & 0x000000ff;
         this.features._incidentVertex = ((this._key & 0x00ff0000) >> 16) & 0x000000ff;
         this.features._flip = ((this._key & 0xff000000) >> 24) & 0x000000ff;
      }
      
   });
   
   return b2ContactID;
   
});
